Ángulos en la circunferencia
https://www.youtube.com/watch?v=wN6ch-Tetog
https://www.youtube.com/watch?v=CJFcXgwJjhU
https://www.youtube.com/watch?v=MrigZcB9N94
https://www.youtube.com/watch?v=Nv1eomFLgyk
https://www.youtube.com/watch?v=snMzkhtoSV4
https://www.youtube.com/watch?v=E0eRYZygw60
https://www.youtube.com/watch?v=KE-nW1mzUbE
Ejercicios con polígonos regulares
https://www.youtube.com/watch?v=ku_GwiCfIpk
https://www.youtube.com/watch?v=X5PQD9r41Zg
https://www.youtube.com/watch?v=uG5yOk0FZpI
https://www.youtube.com/watch?v=1tTkjo1sAI0
https://www.youtube.com/watch?v=RZDiDTaZTB0
https://www.youtube.com/watch?v=s4l-jE3RhVg
https://www.youtube.com/watch?v=sKPZSyk4rGg
https://www.youtube.com/watch?v=8-YOBRSsqpE
Congruencia de triángulos
https://www.youtube.com/watch?v=AKulvWPoQq4
https://www.youtube.com/watch?v=FBeTFJUPxEA
https://www.youtube.com/watch?v=sO02HO_HPDM
https://www.youtube.com/watch?v=Kpve0f88JZs
https://www.youtube.com/watch?v=kpBtpTT3AL0
Semejanza de triángulos
https://www.youtube.com/watch?v=KKhEv3wA7kU
https://www.youtube.com/watch?v=Gq1uyLpF_v0
https://www.youtube.com/watch?v=Pgb3H4Su1EY
https://www.youtube.com/watch?v=MZKO1qwnS4w
https://www.youtube.com/watch?v=sDH4ecxqV6o